(ف) نَهٰى يَنْهٰى نَهْيًاnahā yanhā nahyan (original form: نَهَيَ يَنْهَيُnahaya yanhayu): (1) to forbid, to restrain from an act (2) to be intelligent and discerning (so as to restrain from what is wrong); اِنْهَinha (imperative, amr): forbid! ﴿وَنَهَي النَّفْسَ عَنِ الْهَوٰى﴾ (An-Nāziʿāt 79:40); ﴿اِنَّ الصَّلٰوةَ تَنْهٰى عَنِ الْفَحْشَآءِ وَالْمُنْكَرِ﴾ (Al-ʿAnkabūt 29:45)
نَاهٍnāh pl. نَاهُوْنَnāhūna (active participle, ism fāʿil): one who forbids. ﴿وَالنَّاهُوْنَ عَنِ الْمُنْكَرِ﴾ (At-Tawbah 9:112)
نُهًيnuhany (noun, ism dhāt, singular نُهْيَةٌnuhyah): intellect, intelligence, discernment (which restrains from evil). ﴿اِنَّ فِيْ ذٰلِكَ لَاٰيٰتٍ لِّاُولِي النُّهٰى﴾ (Ṭā Hā 20:54)
Form VI (tafāʿul) تَنَاهٰى يَتَنَاهٰى تَنَاهِيًاtanāhā yatanāhā tanāhiyan: to restrain one another. Only once in the Quran: ﴿كَانُوْا لَا يَتَنَاهَوْنَ عَنْ مُّنْكَرٍ فَعَلُوْهُ﴾ (Al-Māʾidah 5:79)
Form VIII (iftiʿāl) اِنْتَهٰى يَنْتَهِيْ اِنْتِهَآءًintahā yantahī intihāʾan: to restrain oneself deliberately, to desist, to refrain; اِنْتَهِintahi (imperative, amr): desist!; مُنْتَهٍmuntah (active participle, ism fāʿil): one who desists; مُنْتَهًيmuntahany (passive participle, ism mafʿūl, as a noun of place, ẓarf): stopping place, utmost limit. ﴿فَمَنْ جَآءَهُۥ مَوْعِظَةٌ مِّنْ رَّبِّهِۦ فَانْتَهٰى﴾ (Al-Baqarah 2:275); ﴿فَهَلْ اَنْتُمْ مُّنْتَهُوْنَ﴾ (Al-Māʾidah 5:91); ﴿وَاَنَّ اِلٰى رَبِّكَ الْمُنْتَهٰى﴾ (An-Najm 53:42); ﴿عِنْدَ سِدْرَةِ الْمُنْتَهٰى﴾ (An-Najm 53:14)